Reinforced paper and method of making the same.



W. M. WHEILDON.

REINAFORCED PAPER AND METHOD 0F MAKING THE SAME. APPLICATION FILED NOV.30,1917.

l ,26 9, 1 40. Patented June 11, 1918.

1 liti.- W'HEILIDON, 0F ASHLAND, MASSACHUSETTS, ASSIGNOR TO EDWARD H.

-ANGIEM F FRAMING, MASSACHUSETTS.

` L f ECED PAPER AND MTHOD OF M'AKING THE SAME.

Specification of Letters Patent.

.Patented .rene ii, ieee..

To all whom t may concern.'

.DoN, a citizen of the United States, and a resident of Ashland, in thecounty of Middlesex and Commonwealth of Massachusetts, have invented anImprovement in Reinforced Paper and Methods of `Making the Same, ofwhich the following description, in connection with the accompanylilgdrawings,l is a specification, like characters on the drawingsrepresenting like parts.

This invention relates to reinforced paperv and to a method ofmanufacturing the same, and the object is to .provide a laminatedstructure comprising sheets of paper reinforced in two directions bythreads or similar strands, the threads preferably extending at rightangles to each other.

My invention will best be understood by reference to the followingdescription taken in connection with the accompanying drawing whereinFigure 1 is a plan view of a paper web constructed in accordance with myinvention with various of the laminations broken away or separated toreveal the construction' l F ig. 2 is a section on the line 2--2 of Fig.1; and i Figs. 3 and 4 are diagrammatic views eX- plaining steps in themanufacture of the material shown in Fig. 1.

For the sake of brevity I shall first describe a preferred method ofmanufacturing my impro-ved laminated material, as the construction ofthe material itself will be reading understood from the description ofthe process of manufacture.

In Fig. 3 I have diagrammatically illustrated the production of areinforced web of paper comprising two webs or strips 5 and 7 which aresecured together in faceto-face contact by means of an adhesive 9,preferably of a waterproof character, and which have interposed betweenlthem and secured in position by the adhesive longitudinal reinforcingthreads 11. Such material is conveniently made as illustrated by passingthe two webs 5 and 7 between rolls 13, one of the webs being coated withsuitable adhesive, for example bitumen, by means'l of a coating deviceillustrated diagrammaticallyat 15. The threads 11 are drawn from reelsors ools 17, insertedI be- 4 tween the webs 5 and and are drawn out andsecured in positionV as the webs pass through the rolls 13. In Fig. 4. Ihave shown a similar web of paper 19 which is coated on one face withadhesive 21 which may be applied by device 23. Longitudinal threads 25led from suitable spools 27 are applied in spaced relation to that faceof the web which has the adhesive applied thereto and are pressed into`engagement therewith by means of the rolls 29.

By the means illustrated diagrammatically in" Figs. 3 `and 4longitudinal reinforcements may be added to a web of paper with ease andrapidity. In order to produce a sheet which is reinforced bothlongitudinally 4and transversely, I may divide one of theselongitudinally reinforced webs, such as the web 19, into sections 19a(Fig. 4) v each ofV By this means a laminated structure is I' providedcomprising in the present instance threethicknesses of paper united bywaterproof adhesive layers 19 and 21, in which layers are incorporatedreinforcing threads 11 and 25 the directions of which cross insuccessive layers. Furthermore, since paper whichl is ordinarilyproduced in long webs has a marked grain, the grain of the sectionalwebformed of the sections 19a is transverse to the grain vof the webs 5 and7 and the entire structure is thus reinforced apart from the threads.

A structure comprising, as described,three or more layers with the setsof threads which cross incorporated in independent layers of adhesivepossesses particular advantages over reinforced paper which has hithertobeen described and which embodied two sheets of paper having crossedthreads interposed. The crossing of the thread is undesirable since itinterferes to a degree with the stability of the completed structure.Moreimportant is the fact that the laminated structure comprising threelayers possesses considerably more strength for a given weight orthickness and can be produced at a considerably less cost. fl`hreecomparatively thin layers of paper are cheaper than two webs of the samecombined thickness and the laminated structure built up by combiningthem is more Hexible and of greater strength. Furthermore, in thepresent structure the tensile strength of two I undivided webs and 7 iscombined with machines have come into practical use as they are ofcomplicated structure, usually involve a large waste of reinforcingmaterial, and, when the attempt was made to utilize independent threads,it was found impracticable to apply them in a proper state of tensionacross the web so that they would afford any true reinforcement thereto.It is very easy, however, to insert longitudinal threads as illustratedin the diagrams in Figs. 3 and 4 of the present application and by themethod described as seen in Fig. 1, independent transverse reinforcingthreads 25 are provided for the completed laminated structure whichinvolve no waste due to selvage and which are stretched tightly acrossthe sections 192l and provide a true reinforcement to the laminated webagainst transverse disrupting Strains.

While in the accompanying drawings l have illustrated in Figs. l and 2the completed producty as a continuous web, it of course may be` dividedinto smaller sheets, as may be required.

Having thus described a preferred embodiment of my invention, what llclaim as new and desire to secure by Letters Patent is:

l. A method of constructing laminated sheet material comprising thefollowing steps :s-providing webs having on a face thereof -a layer ofadhesive having incorporated therewith reinforcing strands ex-v tendinglongitudinally of the web and assembling sections of one web.transversely with the other web and with 'f lamination of materialsimilar to the weblinterposed between said layers.

2. rlhe method of constructing laminated inesatto sheet materiallcomprising' the following steps z-superposing a pair of webs with aninterposed adhesive layer having longitudinal reinforcing strandsincorporated therewith and applying transversely thereto sections of aweb having an adhesive facing in. which reinforcing strands arelongitudinally stretched whereby to provide a structure of alternatingthicknesses of fabric material and adhesive reinforced with independentsets of strands in the several layers of adhesive, the direction of thestrands in successive sets crossing.

3. The method of constructing laminated sheet material comprising thefollowing steps z-coating a web with adhesive and incorporating in saidadhesive reinforcing strands stretched longitudinally of the web,dividing said web transversely into sections and securing them intraversing relation on another web by means of said adhesive.

et. As a new article of manufacture, a laminated structurel comprisingin serial order as named:-a paper web, a thickness of adhesive, athickness of paper, a` thickness of water repellent adhesive and a paperlayer comprising sections joined end to end, re

inforcing strands in said layers of adhesive and extendinglongitudinally of the web in one layer and stretched transversely acrossthe Same in the other layer., the grain of the paper forming the firstand last laminations mentioned being crossed.

5. As a new article of manufacture, a laminated structure comprising inalterna-l tion three or more paper thicknesses, interposed layers ofadhesive and reinforcing strands in said adhesive layers extended in onelayer transversely to those in an adjacent layer, certain of thethicknesses of paper having the grain thereof relatively crossed.

6. As a new article of manufacture, a laminated structure comprising atrue or continuous web of paper and a web composed of sections set endto end secured thereto by an interposed layer of adhesive, independentreinforcing threads embedded in said adhesive and stretched transverselyacross said webs from edge to edge, the grain of the paper in thecontinuous and sectional webs being crossed.

ln testimony whereof, ll have signed my name to this specification.

WliliLllAM M. WHFLDON.

